All chickens are fine no illness and laying eggs
Any idea what it could be
He had all vaccine too ....am so confused and worry
Do you have any photos of him?
How old is he?
Which vaccine(s) did he have?
What other symptoms does he have, watery eyes, mucous, runny nose, discharge, coughing, sneezing, wheezing, lesions, canker?
What types of food/treats do you feed?
What symptoms/signs/tests did the vet use to determine newcastle?
Generally a comb turning blue is due to heart/circulatory or breathing problems such as gasping for air.
Has he had access to any moldy feed, rotted plant/animal material, etc.
The blue looks like a bit of frostbite to me. High humidity and cold temps can cause frostbite, especially if they have large comb like yours does. The tips may blacken a bit and fall off, but otherwise it doesn't look really bad to where it will blister.
As far as the gasping and sneezing, it could be a respiratory illness, dust from bedding or feed. Sometimes they can get feed or something stuck in their nose or they eat dry food too fast.
It sounds like you are taking good care of him.
Just keep an eye on him and separate him if you see discharge (mucous) from the eyes, nose, etc. or if his breathing starts to sound like a gurgle.